I wonder if it's a coincidence. I did this problem last year, and I want to write a paper about finding the sum of the maximum and minimum values of a function. First of all, it is usually unrealistic to consider calculating two values for this kind of problem, because it is a multiple-choice question and it is not easy to solve. If we consider that the function is obtained by a odd function through translation transformation, then the subproblem is basically worked out, because we know that the sum of the maximum value m and the minimum value m of odd function is 0. Based on this consideration, we can transform. I made a screenshot of word for convenience: You're welcome. Hmm. How interesting